Single unit switchgears J-… series

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Switchgears series J are designed for electricity distribution in the alternating current systems of nominal voltage up to 36 kV.


  • in power stations, heat and power generating plants and distribution substations,
  • in secondary distribution,
  • in industrial plants, to supply construction sites,
  • in strip mining,
  • the switchgear can be installed indoors or in mobile substations.

General characteristics

  • single unit, indoor switchgear, air-insulated,
  • wall mounted or free standing,
  • metal enclosed, with a single system of busbars,
  • cubicles fulfill the requirements of standards on internal arc protection,
  • separated auxiliary circuits compartment,
  • manufactured in high class numerically controlled.


  • small overall dimensions and simple construction,
  • the design switchgear provides safety by performing connecting processes only with closed doors,
  • simple operation and maintenance,
  • applied system of interlocks ensures the correct sequence of switching operations,
  • withstand for internal arcing fault,
  • convenient location of busbar earthing terminals, stable construction easy for transport and installation,
  • possibility of quick replacement the circuit-breaker mounted on a truck,
  • easy access to cable terminations and to apparatus of the main circuit,
  • vacuum or SF6 insulated circuit breakers,
  • prefabricated from standardized parts and repeatable units,
  • possibility of extension, even on site,
  • minimum maintenance and revision requirements,
  • environment friendly production and operation,
  • machining centers, high grade paint coatings,
  • producer's professional service.

Characteristic cubicles of the swichgears

J-7 Outgoing cubicle with a contactorJ-7 Outgoing cubicle with a contactor J-17 (J-24)  Cubicle with a circuit-breakerJ-17 (J-24)  Cubicle with a circuit-breaker 

J-36 Cubicle with a circuit-breakerJ-36 Cubicle with a circuit-breaker

  1. pressure relief flaps
  2. bushing
  3. busbars
  4. low - voltage compartment
  5. disconnector / switch-disconnector
  6. voltage indicator
  7. insulating plate guide
  8. insulating plate
  9. circuit-breaker or contactor
  10. current transformer
  11. earthing switch
  12. trolley
  13. connecting cable

Technical data

Type of the switchgear J-7 J-17 J-24 J-36
Rated voltage kV 7,2 17,5 24  36 
Power frequency withstand voltage kV 20  38  50  70 
Lightning impulse withstand voltage kV 60  95  125  170 
Rated current:      
short-time withstand current
peak withstand current
up to 3150
up to 31,5/1
up to 80 
up to 1250
up to 20/1
up to 50
up to 1250
up to 20/1
up to 50
up to 1250
up to 16/1
up to 40
Internal arc withstand current kA/s up to 31,5/1 up to 20/1 up to 20/1 up to 16/1
Rated frequency Hz 50    
Degree of protection   IP 4X    
Dimensions of cubicles:      
width [A]
height [B]
depth [C]
600 ÷ 1050
700 ÷ 1050
800, 1050
1435, 1735*
Internal Arc Classification   AFLR    
Loss of Service Continuity Classification   LSC2A
Compliance with standards   PN-EN 62271-200; PN-EN 62271-1
*According with circuit breaker VD4 type and voltage transformers

Exemplary schematic diagrams

Product card in pdf formatSingle unit switchgears J-… series plik .pdf

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